Bad GEM Question - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 11-17-2012, 10:12 AM Thread Starter Fanatic
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Bad GEM Question

So the father in law and I were trying to figure out why his 4x4 wouldn't work. Got the codes out of ae. Got hold of pin point tests. Did them comes down to bad gem. So just to make sure we hooked his shift motor onto my truck just to make sure it work, so it does. Know for sure it's the gem. Anyways where I'm going is with his 01 lariat the gem has to be flashed for his truck? What kinda prices is one expecting for new gem and a flash if need be? Done some research found couple sites with cost and such. Just looking for more input. Thanks!

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02 F350 CC LB 4x4 Lariat
Done: K&N CIA, Torklift Camper tie down system, Firestone Ride Rite Air Suspension(Dual guage control, w/ reservoir tank), Autometer 3 Pillar guage(Boost,EGT,Tranny Temp), Vision Type 81 19.5" w/ Goodyear G622 RSD 245/70r19.5 LRG, 03-07 power/heat/light mirror conversion, Sinister Coolant Filter kit.
ToDo: Powerslot Cryo rotors, Hawke SD pads, 6.0L Tranny Cooler, Oil Temp/Pressure, Fuel Pressure and Diff Temp guages.
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post #2 of 8 Old 10-01-2013, 01:50 PM Rookie
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I have a 99 lariat with same problem

99 F250 Lariat -Cross breed-muffler delete-6637
98 Trans Am-lq9.402-gt4788-4l80e-12bolt-street car
00 Durango SLT-360-22x10's-285/55/22terragrapplers
Yea Im a gear head
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post #3 of 8 Old 10-01-2013, 01:55 PM
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not promoting them but they do have decent info

Ford GEM Modules Auto Parts Cheaper Blog

Please donate to DTR Ron's Memorial
We Miss you Ronnie
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post #4 of 8 Old 10-01-2013, 02:01 PM
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Nice read ZMANN

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post #5 of 8 Old 10-02-2013, 07:16 AM
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I read somewhere that the 2003s are different than other years but I had the same problem and found that my 4x4 Module behind the glovebox was corroded. I replaced it with the one below and it solved the problem.

2003 Ford Super Duty Excursion Gem Shift Control Module 4x4 w Esof New | eBay

2008 F250 6.4 Lariat
4" Turbo Back, AFE Dry Intake, EGR Block Plates, SCT Livewire TS with PIP tuning, 2.5" Level, 35 Toyo M/T

2003 F250 7.3 XLT
6637, 4" Exhaust, 50 hp tune, Irate Regulated Return, HPx, Bellowed Up-Pipes, Boost Trans and EGT Gauges, 2.5" Level Kit, Sky Jacker Dual Stabilizers, 305/70r16 Fierce Attitude M/T
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post #6 of 8 Old 10-02-2013, 04:15 PM
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Damn those are pricey....

I know a little about the GEM from my factory power window/lock install, and they are simpler than I thought. You're best bet it junkyard and likely just tell them you want the fusebox, since it's on the back of it.

In the ebay ad that Nolooseends posted you can see that GEM has the spots for 3 connectors, not all of them do. My XL truck had only 1, the donor truck with power options used 2, the other spot just having no pins.

So junkyard search for a truck with the same options, and year range (99-01, or 01.5-03) and you should be fine. If you want to go the reflash route you MUST make sure that the truck has at least similiar options so that the GEM is physically able to control all of yours ( check to see how many connectors it has)

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #7 of 8 Old 10-03-2013, 11:16 AM
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So, I'll pick a few of your brains. My truck has had issues ever since I had a leaking front windshield like the company in the link above explains. I had it pulled out and resealed but the damage was done I think. It's been slowly doing weird crap over the past couple years. Right now, my windshield wipers will do whatever they want if turned on or usually they won't turn on at all or just stutter. Also, my ebrake light and door ajar lights are flashing on the dashing most of the time while i'm driving. I have manual locks and disconnected the door ajar plugs in the doors so I'm guessing it's the GEM module. My truck is an XL model so it has the floor shifter for the 4x4 and has the 4R100 trans. Crank windows etc . . .

Should i get one from the scrapyard or should i spend the money from this site you referenced on here?? I have a buddy that is in sales at the yard so I could get a deal on one but I have a lot of stuff spliced into the box so I don't really want to do this twice if you know what I mean.
Thanks for the help as always . . . which is why I try to help on this site as much as possible.

Also, when I was trying to use my SCT xcal II tuner the other day it was having issues and I noticed the OBDII plug had a few terminals that were green with corrosion. I was able to clean it up a little and got the tuner to work but I hope this doesn't mean i need to replace that harness also??

Here's a pic of my truck . . .

2008 F350 CCSB FX4 Amsoil fluids, S&B intake, 5" exhaust, Egr delete, Boss V plow, Mega Duty Title mod.
Winch Piece for ATV or Jeep 84.m1555.l2649

Last edited by Quickhorse; 10-03-2013 at 11:25 AM.
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post #8 of 8 Old 10-03-2013, 11:32 AM
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Originally Posted by RollinEarly99 View Post
Nice read ZMANN
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